arm circumference percentiles P3–P97, Japan

Japan’s published arm circumference figures, P3 to P97 month by month, up to 5 years. Boys and girls separately.

boy

Age in years runs along the bottom and arm circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 11.7 to 19.5. The full figures are in the table above.

Japan percentile curves for arm circumference, boy.

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yearsmonths

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Japan · arm circumference, boy（cm）
Age	P3	P15	P50	P85	P97
3 months	11.7	12.5	13.5	14.6	15.5
4 months	11.9	12.8	13.8	14.9	15.9
5 months	12.2	13.0	14.1	15.2	16.2
6 months	12.3	13.1	14.2	15.4	16.4
7 months	12.4	13.3	14.4	15.5	16.5
8 months	12.5	13.3	14.5	15.6	16.7
9 months	12.5	13.4	14.5	15.7	16.7
10 months	12.6	13.5	14.6	15.8	16.8
11 months	12.6	13.5	14.6	15.8	16.9
12 months	12.7	13.5	14.6	15.9	16.9
13 months	12.7	13.5	14.7	15.9	16.9
14 months	12.7	13.6	14.7	15.9	17.0
15 months	12.7	13.6	14.7	16.0	17.0
16 months	12.8	13.6	14.8	16.0	17.1
17 months	12.8	13.7	14.8	16.0	17.1
18 months	12.8	13.7	14.8	16.1	17.2
19 months	12.9	13.7	14.9	16.1	17.2
20 months	12.9	13.8	14.9	16.2	17.3
21 months	13.0	13.8	15.0	16.2	17.3
22 months	13.0	13.9	15.0	16.3	17.4
23 months	13.1	13.9	15.1	16.4	17.5
2 years	13.1	14.0	15.2	16.4	17.5
2y 3m	13.3	14.1	15.3	16.6	17.8
2y 6m	13.4	14.3	15.5	16.8	18.0
2y 9m	13.5	14.4	15.6	17.0	18.2
3 years	13.6	14.5	15.7	17.1	18.3
3y 3m	13.7	14.6	15.8	17.2	18.5
3y 6m	13.7	14.7	15.9	17.4	18.6
3y 9m	13.8	14.8	16.0	17.5	18.8
4 years	13.9	14.8	16.1	17.6	18.9
4y 3m	13.9	14.9	16.2	17.7	19.1
4y 6m	14.0	15.0	16.3	17.8	19.2
4y 9m	14.1	15.1	16.4	18.0	19.4
5 years	14.1	15.1	16.5	18.1	19.5

girl

Age in years runs along the bottom and arm circumference（cm） up the side. The five lines are, from the bottom, the 3rd, 15th, 50th, 85th and 97th percentiles, ranging from 11.2 to 20.1. The full figures are in the table above.

Japan percentile curves for arm circumference, girl.

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yearsmonths

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Japan · arm circumference, girl（cm）
Age	P3	P15	P50	P85	P97
3 months	11.2	12.0	13.0	14.2	15.3
4 months	11.5	12.3	13.4	14.6	15.7
5 months	11.7	12.5	13.6	14.8	15.9
6 months	11.8	12.6	13.8	15.0	16.2
7 months	11.9	12.8	13.9	15.2	16.3
8 months	12.0	12.8	14.0	15.3	16.4
9 months	12.0	12.9	14.1	15.3	16.5
10 months	12.1	13.0	14.1	15.4	16.6
11 months	12.1	13.0	14.2	15.4	16.6
12 months	12.2	13.0	14.2	15.5	16.6
13 months	12.2	13.1	14.2	15.5	16.7
14 months	12.3	13.1	14.3	15.6	16.7
15 months	12.3	13.2	14.3	15.6	16.8
16 months	12.4	13.2	14.4	15.7	16.8
17 months	12.4	13.3	14.4	15.7	16.9
18 months	12.4	13.3	14.5	15.8	16.9
19 months	12.5	13.4	14.5	15.8	17.0
20 months	12.6	13.4	14.6	15.9	17.0
21 months	12.6	13.5	14.7	16.0	17.1
22 months	12.7	13.6	14.7	16.0	17.2
23 months	12.7	13.6	14.8	16.1	17.3
2 years	12.8	13.7	14.9	16.2	17.4
2y 3m	13.0	13.9	15.1	16.5	17.7
2y 6m	13.2	14.1	15.3	16.7	17.9
2y 9m	13.3	14.2	15.5	16.9	18.1
3 years	13.4	14.4	15.6	17.1	18.4
3y 3m	13.5	14.5	15.8	17.3	18.6
3y 6m	13.6	14.6	16.0	17.5	18.8
3y 9m	13.7	14.7	16.1	17.6	19.0
4 years	13.8	14.8	16.2	17.8	19.2
4y 3m	13.9	15.0	16.4	18.0	19.5
4y 6m	14.0	15.1	16.6	18.2	19.7
4y 9m	14.1	15.2	16.7	18.4	19.9
5 years	14.2	15.3	16.9	18.6	20.1

About this table

The figures come from the government survey itself — the 2023 Infant and Toddler Growth Survey published through e-Stat — rather than from the paediatric endocrine society’s charts, which are drawn from the 2000 survey.
The survey covers birth to 6 years, and head circumference only to 3. Japan publishes school-age figures separately, but as means without a percentile distribution, so nothing above 6 years can be read from them. WHO covers that range here instead.